Carbureter



C. F. SCHULZ.

CARBURETER.

APPLICATION man FEB. 9. 1915.

1,356,661. I Patented (m 26,1920.

2 SHEETSSHEET I.

r v 1 INI/ENTOR.- WITNESSES CARL I? SCHULZ.

4 ATTORNEY.

C. F. SCHULZ.

- CARBURETER. I

APPLICATION FILED rams. I915. I

1,356,661. Patented .0015. 26,1920.

2 SHEETS-SHEET 2.

Iz'y. 2.

INVENTOR. wmwzssss: I 0,451, ft SOHULZ.

ado. Maw/z.- BY A f4 fi bmj I UNITED STATES.

PATEN OFFICE.

CARL F. SCI-IULZ, OF NEW YORK, N. Y.

CARIBURETER.

Application filed February State of New York, have invented a new and useful Carbureter, of which the following is specification.

The object of my invention is to provide I a' carbureter which will deliver a firing mixture of substantially uniform quality.

A further object of my invention is to provide a carbureter which will produce a firing mixture at low rotative speed of the engine to which it is connected, whereby easy starting is accomplished, and slow car speed obtained. p A further object of my invention is to provide a oarbureter which shall be responsive to sudden demands for fuel.

Another object of my invention is to provide a carbureter which is simple and easy to manufacture.

Other and further objects of my invention will be readily understood by persons skilled in the art from a consideration of the following description, taken inconjunction with the drawings, wherein- Figure 1 is a vertical cross section, through the body portion of the carbureter and Fig. 2 is a side elevation of the rear view of Fig. 1.

Fig. 3 is an enlarged view of one of the plugs used to close cold air openings in the air chamber.

In the drawings, 1 is the bowl which contains the usual float 2 and having a pipe connection 3 running to the fuel supply tank. The valve for controlling the inlet of the fuel through the pipe 3 and which is oper-- ated by the float 2 is not shown in the sectional view taken but this detail is well understood and need not be described. The bowl 1 has an outlet, which is shown fitted by the plug A. Above the bowl 1 is an air chamber 5, having a funnel shaped portion 6 extending downward, whereby the chamber 7 which will be referred to later, is formed. Attached to the lowerportion of 6 is a knob 8, which is threaded at 9 and having a shoulderlO, adapted to engage a corresponding shoulder in the bowl 1. 11 is a nut which engages the knob 8, drawing the same downward to make a tight fitting joint at the shoulder 10 and also at the shoulder 12 on the upper part of the bowl 1.

Mounted within the chamber 7 is an in- Specification of Letters Patent.

Patented Oct. 26, 1920.

9, 1915. Serial No. 7,122.

spirator 13, having an opening 14: at its lower endinto the bowl or fuel chamber. The air chamber 5 has an opening 15 into whlch a pipe can be clamped by the screw 16. .This pipe is for the purpose of bringing warm air, from the usual connecting means on the exhaust pipe, to the carbureter.

In the side of the air chamber 5 are holes 17 for the purpose of taking in cold air, if necessary. These holes, if not required, are adapted to be readily plugged up as by plugs P, one form of which is shown in Fig. 3, so that the,requisite amount of cold air can be obtained when the carbureter is adjusted to a certain type of engine. Opening upward from the air chamber 5 is a port opening 18 which opens directly into the mixing chamber 19, which has the usual opening 20 into the intake manifold of the engine and a throttle valve 21 controlled by a lever 22. In the preferred form shown, directly above the mixing chamber 19 is a projection 23, which will be hereinafter referred to as the compression air chamber. This chamber is closed by the cap 24. Within the chamber 19 is a thimble 25, attached to the walls of the chamber and which serves as a guide for the stem 26, which is attached to the suction valve 27. The valve 27 is adapted to normally seat within the port opening 18. The central part of the suction valve 27 is hollowed out as indicated by 28 and has openings 29 at the top which lead from the hollow portion 28 into the mixing chamber 19. The stem 26 is threaded internally and adapted to receive a needle valve 30, threaded to within a proper distance of the top for a purpose hereinafterdescribed and the lower end of which has a tapered point or metering pin 31. In order to get a perfect-alinement betweenthe needle valve and the inspirator, I have made use of a universal or ball and socket joint between the body portion of the needle valve 30 and the point 31, so that as the Valve 30 is adjusted V by the. knurled head 32, the point 31 will line up with the inspirator nozzle 13, withoutthe nut 35 on. the needle valve 30, which also serves to clamp the tension member 36 in .47, opening into the float chamber at a point 1 position, and on account of the needle valve 30 being threaded to within a proper distance of the knurled head 32, the nut 35 serves as a positive stop to prevent the needle valve 30 from being screwed in so far as to wedge the point 31 in the inspirator nozzle 13. The upper end of the tension member 36 is notched at 37 for the purpose of engaging the knurled head 32, whereby the needle valve 30 is held in its adjusted position but which adjustment can be readily changed. At the upper part of the thimble 25, near the compression air chamber is an annular groove 38, which is connected by the hole 39 to the outside of the case. The purpose of this groove and hole is to allow air to pass to the bottom side of the piston 33, so that no vacuum can be formed below the piston when it is operated. 0

Attached to the piston and passing through the wall of the mixing chamber is a guide rod 40, which holds the piston and suction valve 27 in position. The lower part of the suction valve 27 extends down- Ward nearly to the bottom of the chamber 7 for a purpose which will be hereinafter described. Extending from a point near the bottom of the chamber 7 is a small passage or tube 41, the upper end of which terminates near the port opening between the air chamber'5 and the mixing chamber 19. The function of this tube will be here-- inafter described. Extending from a point 43 in the top of the float chamber is a tube or passage '42 which terminates within the compression air chamber 23. The function of this tube will be described later. Mounted on the side of the carbureter is an adjusting valve 44, the lower portion 45, which controls an opening leading from a point 46, which opens into the mixing chamber in line with or slightly beyond the valve 21, when this valve is in closed position. The opening at 46 leads to the tube below the normal level of fuel therein.

The valve 44 can be operated, if necessary, by a suitable rod extending to the dash or some other point within reach of the operator.

In practice the needle valve 30 is normally set, so that there is a slight clearance 48 all around the point 31 and the inspirator 13. The float 2 is adjusted so that the normal level of the fuel is just about on a line with the top part of the inspirator 13. Since there is a slight opening 48 around the point 31 of the needle valve, the fuel will creep over, or as I term it, will fountain over into the chamber 7 and a puddle will be formed in the bottom of this chamber. I, therefore, name this a puddle chamber. Should, for any reason, the float 2 fail to operate its valve and shut olf the fuel and the puddle be raised beyond the top of the inspirator 13, then it can flow out by the over flow pipe 49 which extends somethe engine to draw fuel at slow speeds and it also aids in starting the engine by applying a direct suction on the fuel. Inasmuch as a control rod may be extending from 44 to the .operators seat this adjustment may be varied at will, either forv facilitating starting or idling.

After the engine has been stopped for I some length of time a puddle of fuel is formed in the puddle chamber 7 so that when the throttle is again opened and the engine started the suction produced, draws air through the opening 15 and the auxiliary openings 17, downward in the funnel shaped portion 6 around the extension 50 of the suction valve, throughthe openings 29 into the mixing chamber. At the same time, the valve is raised slightly off its seat and by means of the tube 41 raw fuel is drawn directly out of the tube 41 at the edge of the valve seat into the mixing chamber; also as the suction valve 27 is further raised, it carries the needle valve 30 with it, increasing the opening 48 at the top of the inspirator and additional fuel is taken therethrough. It is thus seen that I have provided a plurality of means of obtaining a direction suction on the fuel in order to make starting easy. It is to be understood that after a few moments running of the engine that all the fuel in the puddle chamber 7 will be used up and the fuel will then be metered through the inspirator 13 under control of the suction valve 27 which in turn controls the metering pin 31 carried on the needle valve 30. It is to be further'noted thatas the suction valve rises, air is shunted away from around the inspirator nozzle 13 and passes through the port opening 18 directly 'into the mixing chamber and as the speed of the engine increased due to opening the throttle valve 21 the proportion of air admitted to the mixing chamber is greater than the proportion of raw fuel and thevalve 27 is lifted by suction, the narrow part 51 rises above the top of the inspirator and the air passage around it is increased inproportion to the lift and suction on the inspirator is thereby diminished, further tending to give a leaner mixture with increase of speed. It will be readily seen that when the valve 27 is closed, the Venturi construe tion 51 of the hollow part 28, produces a maximum suction on the inspirator when the throttle 21 is opened suddenly and this taken with additional means which will now be described gives a quick get-away.

In order to obtain a quick get-away, just referred to, when the throttle valve 21 is opened suddenly, I provide the piston 33, carried on the stem 26 of the suction valve 27. As this valve is drawn quickly upward, the air in the compression chamber 23; is compressed and is forced through the passage or tube 42, into the fuel chamber. v1a opening 43 thereby putting pressure on the fuel which forces it suddenly upward through the inspirator nozzle 13, thereby injectin fuel quickly into the mixing chamber.

be a very valuable feature where stops are numerous at street crossings and trafiic becomes congested as it is advantageous to get a quick start in order to help relieve and get out of the congestion.

I have found by tests that excellent results are obtained by making the piston out of a special grade of carbon, graphlt'e or some self lubricating substance, whereby the friction with the walls of the chamber 23 is reduced to a minimum and sticking prevented so that it is not necessary to use a .spring to aid in returning the suction valve 27.

In carrying out the principles of my 1nvention, I have constructed my carbureter in such a manner that it is very compact and particularly adapted to go on automobile en ines where space is an important factor.

hile I have shown one preferred form of my invention, it will be apparent to anyone skilled in the art that numerous changes and alterations may be made without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In a carbureter, a mixing chamber, a main air chamber, a fuel supply chamber, a compression air chamber, an inspirator located in the main air chamber and having one end opening into the fuel supply chamber, a suction valve between the mixing chamber and main chamber, a spindle attached to said suction valve and extending into said compression air chamber, a passage connecting the compression air chamber with the fuel chamber, a piston mounted on said spindle within said compression air chamber for compressing air and forcing it 11 large cities, I have found this to a channel connecting the fuel chamber and the hollow part of said suction valve, a spindle attached to said suction valve and" extending into the compression air chamber, a needle valve carried by said spindle and adapted to enter the opening into said inspirator within the suction valve, a passage connecting the compression air chamber with the fuel chamber and means within said compression chamber associated with passage to said fuel chamber for the purpose described;

3. In a carbureter, a mixing chamber, a

main air chamberjja. fuel supply chamber, a

by, said needle valve cooperating with-said inspirator and piston whereby a sudden upward movement of said parts causes an ex tra quantity of fuel to pass through said mspirator for the purpose described.

4. In a carbureter, a mixing chamber, a main air chamber, a fuel chamber, a compression air chamber, a suction valve and a fuel valve controlled thereby, a passage connecting said compression chamber with said fuel chamber and means within said compression chamber and controlled by said suction valve for forcing air through said passage to increase the flow of fuel from said fuel chamber.

5'. In a carbureter, a mixing chamber, a main air chamber, a fuel chamber, a suction valve and a fuel valve controlled thereby, means co'ciperating with said suction valve for forcing air into the fuel chamber thereby augmenting the atmospheric pressure on said fuel to force an increased amount thereof by said fuel valve when it is suddenly raised, for the purpose described.

6. In a carbureter, a mixing chamber, a main air chamber, a fuel chamber, a compression air chamber having an opening connecting with the fuel chamber, a hollow x said spindle for forcing air through said tion in the mixing chamber, an inspirator.

- having two openings, one being into the fuel chamber, the other into the hollow part of said valve, a spindle attached to said valve and carrying a fuel valve adapted to enter the inspirator opening within the hollow part of said first mentioned valve and means within the compression air chamber and carried by said spindle for causing an increased flow of fuel from the inspirator when said valves are suddenly lifted.

7. In a carbureter, a mixing chamber, a main air chamber, a. fuel chamber, a compression chamber, a suction valve between said mixing and main air chambers, an inspirator opening into the fuel chamber and extending upward in the main air chamber, a spindle attached to said valve, and extending into said compression chamber, a passage connecting the compression chamber with the fuel chamber, a needle valve carried by said spindle and adapted to cooperate with said inspirator to regulate the fuel passing therefrom, meanswithin the compression chamber and carried by said spindle for compressing air and forcing it through said passage into the fuel chamber when said needle valve is suddenly raised by the suction valve and means carried by said spindle to limit the normal relation between the inspirator andsaid needle valve.

8. In a carbureter, a'mixing chamber, a main air chamber, a fuel chamber, a com pression chamber, a suction valve between said mixing'and main air chamberan in spirator opening into the fuel chamber and extending upward in the main air chamber, a spindle attached to said valve andnextending into said compression chamber, a passage connecting the compression chamber with the fuel chamber, a needle valve carried by said: spindle and adapted to cooperateiwith said inspirator to regulate the fuel passing therefrom, means within said compression chamber and carried by said spindle for compressing air and forcing it through said passage into the fuel chamber whereby an increased amount of fuel is sent through the inspirator when the, needle valve is suddenly lifted by said spindle, and

means for adjusting the position of said needle valve in said spindle and means carried by; said spindle to hold the needle valve in its adjusted position. a v

9. In a carbureterfia mixing chamber, a

main air chamber, a fuel chamber, a suction valve between said mixing and main air chambers, an inspirator opening into the fuel chamber-and extending upward in the main air chamber, a spindle attached to said valve and extending beyond said mixing chamber, a needle valve carried by said spindle and adapted to cooperate with said 10. In a carbureter, a mixing chamber, an

air chamber, a fuel chamber, said air chamber having a part extending downward below the level of the fuel in the fuel chamber, a port opening between the mixing and air chambers and a suction valve normally seated therein, an inspirator and a fuel valve adapted to co-act therewith, said fuel valve being controlled by said suction valve and a fuel passage extending from a point at the edge of the seat of said suction valve to a point below the normal level of the fuel in the fuel chamber to which point fuel is supplied when the carbureter is idle. I

11. In a 'carbureter, a mixing chamber, a fuel chamber and an air chamber having a part projecting downward into the fuelchamber and below the normal level of the fuel therein, whereby-a puddle chamber is formed, an inspirator mounted in said puddle chamber and opening into the fuel chamher, a hollow suction valve between said mixing and air chambers, a fuel valve carried by said suction valve and means to adjust the fuel valve whereby when the carbureter is idle, the fuel is allowed to fountain over into the puddle chamber and a fuel passage extending from a point at the edge of the suction valve seat into the puddle chamber forthe'purpose described.

12. In a carbureter, a mixing chamber, an air chamber, a fuel chamber and a compression airchamber, a passage between said fuel and compression air chambers, a suction valve between said mixing and air chambers and having a stem projecting into the compression air chamber and a piston mounted on said stem, whereby when said valve is operated air is forced through said passage to create pressure on the fuel in the fuel chamber, an inspirator and a fuel valve adapted to co-act therewith, said fuel valve being controlled by said suction valve, a guiding thimbl-e for said suction valve stem and an annular groove in said thimble near said compression air chamber and opening to the outer air, for the purpose described.

13. In a carbureter, a mixing chamber, an air chamber,'a fuelchamber and a" compression air chamber above said mixing chamber, a passage between said fuel and compression air chambers, a hollow suction valve chamber for compressing air in said chamber arid forcing it through said passage into mixing I lar groove in said thimble near the compresthe fuel chamber, a'fuel valve within the stem and an inspirator adapted to co-act therewith, a guiding thimble within said chamber for said stem and an annusion air chamber and extending to the outer air for the purpose described,

14:. In a carbureter, a mixing chamber, a main-air chamber, a fuel supply chamber, a compression air chamber, a passage between said fuel and compression chambers, an inspirator located in the main air chamber and having one end opening into the fuel supply chamber, a suction valve between the mixing chamber and main chamber, a spindle attached to said suction valve and extending into said compression chamber, an anti-friction piston mounted on said spindle for compressing air in said compression chamber whereby the same is forced through said passage into the fuel chamber, and a needle valve passing through the said spin dle and adapted to cooperate with said.1nspirator to meter the fuel passing therethrough.

,15. In a carbureter, a mixing chamber, a main air chamber, a fuel chamber, an air compression chamber, a suction valve and a fuel valve controlled thereby, a passage connecting said compression air chamber with said fuel chamber and anti-friction means within said compression chamber and controlled by said suction valve for forcing air through said passage to increase the flow of fuelfrom said fuel chamber.

- 16. In a carbureter, a mixing chamber, a

" mai'n air chamber, a fuel supply chamber, a,

compression air chamber, a suction valve I 5 having a hollow portion forming a; Ventun tube'between the mixing and main air chambers, an msplrator located in the main alr chamber and encompassed by said Venturi tube and having a'channel connecting the fuel chamber j'a'nd 'the'hollow part of said suction valve, aspindle' attached to said succhamber with the fuel chamber and means.

Within said compression air chamber associated With said spindle for forcing air through said passage into said fuel chamber for the purpose described.

17 In a carbureter, a mixing chamber, a main air chamber, a fuel supply chamber, a compressionair chamber, an inspirator located in the main air chamber and having one end opening into the fuel supply chamber, a suction valve between the mixing chamber and main air chamber, a spindle attached to said suction valveand extending into said compression air chamber, a passage extending from said chamber into the fuel chamber, a piston mounted on said spindle and a needle valve carried thereby, said piston having means for preventing friction, said needle valve cooperating with said inspirator and piston, whereby a sudden upward movement of said parts causes an extra quantity of fuel to pass through said inspirator for the purpose described.

18. In a carburetor, a mixing chamber, a main air chamber, a fuel chamber, an air compression chamber, an air admission valve, a passage connecting said compression air'chamber with said fuel chamber; said air valve carrying a pressure exerting member cooperating with said compression CARL F. SCHULZ. In the presence of ALBION D. T. LIBBY, HEL N B. POOLE. 

